Triphenylmethane dyestuffs



Patented Dec. 28, 1937 The present invention the manufacture of PATENT OFFlC 2,103,846 5 TRIPHENYLMETHANE DYESTUFFS- Hans Grotowsky, Krefeld-Uerdingen, Germany,

assignor to General Aniline Works, Inc., New

York, N. Y., a corporation of New York No Drawing. Application October'2,

No. 103,669. In Germany rial 1935 relates to a process for triarylmethane dyestufis by introducing in any customary manner during the synthesis of thedyestuffs one or more aryl radicles containing one or more amino groups substituted by at least one acid radicle.

The new dyestufis are arylated ethyl sulfonic produced in accordance with the known methods for the manufacture of triarylmethane dyestuffs aromatic amine containing one or groups substituted by at sulfonic acid appropriate aldehyde to Thus for example an more amino least one arylated ethyl radicl'e can be condensed with an the corresponding leuco triarylmethane compound and the latter can be oxidized to the dyestufis.

the manufacture of dyes an arylated chloroethane Another method for tufts consists in causing sulfonic acid to act on a dyestuff of the triarylmethane series containing at least'one primary or a suitable compound of the digroup. Finally secondary amino arylmethane series can be employed as a starting material and contain at least one amino group provided that it does not already substituted by at least one arylated ethylsulfonic acid radicle, this can be introduced in accordance with the known methods prior to or after the synthesis of the triarylmethane dyestuffs.

When employing leuco compounds of the triarylmethane dyestuffs as starting material or when in the process stuffs are obtained be converted into the known manner.

The aryl radicles of the of manufacture the new dyein theleuco the dyestuffs form these can by oxidation in triarylmethane dyestuffs of this invention may be any aromatic radicle, such radicle.

as for example, a phenyl or naphthyl This radicle may carry besides the substituents mentioned before other substituents as is customary in the case stuff, thus for example methyl, ethyl oxy group, alkyl oxy gr and propyl groups,

halogen atoms,

or bromine, amino groups of triarylmethane dyealkyl groups, such as the phenolic oups, such as methoxy, such as chlorine substituted by other components than arylated ethyl sulfonic acid radicles,

group or diaryl amino group,

sulfonic acid group etc.,

tioned that at least two aryl kylated phenolic hydroxy group,

such as for example the dialkyl amino furthermore the it being especially menradicles of the dyeleast one auxochrome, hydroxy group, an alsuch as a methoxy or ethoxy group, an amino or substituted amino group,'such example, methyl, ino. group and substituted by as an alkyl amino group, for dimethyl, ethyl or diethyl amnaturally also an amino group at least an arylated ethyl sulfonic acid radicle the introduction of which in the dyestuff is the substance of this invention.

able by the introduction of a halogen atom,

' sulfonic acid to styrene, the

1936, Se- October 8,

5 Claims. (01. 260- 68) As starting materials for the manufacture of triarylmethane dyestuffs in accordance with this invention amino sulfonic acids are primarily suitable as are obtained by condensing an aromatic amine with an additive compound of chlorosule ionic acid to an organic compound comprising a double bond of aliphatic nature between two carbon atoms, onerof which is connected with an aromatic nucleus in accordance with the process described in U. S. P.2,097,726, issued November 2, 1937. According to the process of said patent chlorosulfonic acid can be caused to react in a smooth manner with organic compounds of the kind mentioned before especially in the presence of a solvent, such as diethyl ether, dipropyl ether etc. Among the organic compounds which are suitable for the purpose of this addition of chlorosulfonic acid may be mentioned styrene, vinyl naphthalene, ac'enaphthylene, isosafrol, cumarone and indene. Instead of thesecompounds substitution products thereof can be employed, as forexample those compounds obtainsuch as for example a chlorine or a bromine atom or a nitro group, a sulfonic acid group; an alkyl group, such as for example a'methyl, ethyl, propyl or butyl group, furthermore an aralkyl group, such as for example a benzyl group and several of the above mentioned atoms or groups.

In the resulting sulfonic acids, such as for example in the l-phenyl-l-chloroethane-2-sulfonic acid obtainable by the addition of chlorochlorine atom is readily replaceable. Thus by dropping the reaction mixture into a primary or secondary aromatic amine replacement of the chlorine by the aryl amine group takes place. From this mixture the aromatic amine carrying the amino group substituted by at least one arylated ethyl sulfonic acid radicle can be isolated by any known suitable manner.

The new dyestuffs are soluble in water, possess a very good clarity of dyeing and dye in a remarkable, fairly even manner. In the form of the alkali metal salts they are powders having a metallic luster, dyeing animal fibres generally red to reddish violet to blue and green shades.

The following examples will illustrate the invention.

- 7 Example 1 For this example an amino sulfonic acid being obtainable inthe following manner is employed: An ethereal solution of 1 molecule of the additive compound of chloro-sulfonic acid to styrene obtainable according to Example 1 of U; S. Patent 2,097,726, is dropped at 0-10 G; into the three times molecular quantity of monoethyl aniline. By addition of alkali lye the reaction mixture is made alkaline and the excess monoethyl aniline driven oiT by water steam. Then the l-phenyl- 1- (ethyl-phenyl-) amino-ethane-Z-sulfonic acid is precipitated with diluted sulfuric acid. This the like. The salting out. shade.

resulting dyestuff is isolated by It dyes wool a clear violet-blue Example 2 The amino sulfonic acid employed in this example is produced in the following way: 1 molecule m-toluidine is condensed with 1 molecule l-phenyl-l-chloroethane-Z-sulfonic acid (obtainable by the addition of styrene according to Example 1 of U. S. Patent 2,097,726) to the l-phenyl-l-(m-tolyl-amino)- ethane-Z-sulfonic acid according to the method mentioned in Example 1. This acid is then sulfonated with 1 molecule chloroethane sulfonic acid to the disulfonicacid. 1 molecule of this disulfonic acid is heated with 1 molecule tetramethyl diamino 'benzhydrol in aqueous slightly sulfuric acid solution until the hydrol is no longer present. After oxidizing in the known manner the leuco acid gives a dyestufi which dyes animal fibre a blue-violet shade.

Example 3 2 molecules of the amino sulfonic acid obtainable by condensation of the additive compound of chlorosulfonic acid to styrene with o-toluidine according to the process described in Example 1 are heated to boiling for 24 hours with diethyl .amino benzaldehyde. In this manner a leuco acid is produced which on oxidizing with manganese dioxide furnishes a dyestufi dyeing wool clear reddish violet.

Example 4 The amino sulfonic acid used in this example is obtainable in the following manner: An ethereal solution of 1 molecule of the additive compound of chlorosulfonic acid to indene (obtainable according to Example 5 of U. S. Patent 2,097,726) is dropped at -10 C. into the three times molecular quantity of Example For this example an employed obtainable in amino sulfonic acid is the following manner:

alkaline by the addition An ethereal solution of 1 molecule of the additive compound of chlorosulfonic acid to cumarone (obtained according tothe process of Example 4 of U. S. Patent 2,097,726) is given into the three times molecular quantity of monoethyl aniline at 0-10" 0. Then the reaction mixture is made of alkali solution and the excess monoethyl aniline driven ofi by water steam. Now the 3-(ethyl-phenyl)-amino-cumarone-2-sulfonic acid is precipitated with diluted sulfuric acid. 2 molecules of this sulfonic acid are heated with 1 molecule of diethyl amino benzaldehyde in a slightly acid solution until the condensation is finished. After treatment with oxidizing agents the leuco acid yields a violet dyestuif.

Example 6 1 molecule o-chlorobenzaldehyde is boiled under reflux in aqueous solution for 24 hours with stirring with 2 molecules of the amino sulfonic acid obtainable by the condensation of l-phenyl- 1-chloroethane-2-sulfonic acid with o-toluidine according to the process mentioned in Example 1. On oxidation the resulting leuco acid yields a dyestuff which gives a clear green blue on wool.

Example 7 2 molecules of the l-phenyl-l-(ethyl-phenyl)- amino-ethane-Z-sulfonic acid obtainable according to the process described in Example 1 are heated in a 30% ethyl alcohol with 1 molecule formaldehyde until the methane condensation is complete. The volume is then brought to one litre, with advantage by means of 30% ethyl alcohol, 1 molecule of diethyl aniline and the cal culated quantity of dichromate are added and the mixture stirred at 40 C. until the formation of dyestuff is no longer increased. The alcohol is then distilled off, the chromium oxide residue is filtered and the dyestufi" precipitated from the filtrate by means of common salt solution. The dyestuff produces very clear blue-violet shades on wool.

I claim:

1. A triarylmethane dyestuff containing at least one aryl radicle carrying at least one auxochrome and at least another aryl radicle carrying at least one amino radicle substituted by at least one arylated ethylsulfonic acid radicle.

2. A triphenylmethane dyestuff containing at least one phenyl radicle carrying at least one auxochrome and at least another phenyl radicle carrying at least one amino radicle substituted by at least one phenylated ethylsulfonic acid radicle.

3. A triphenylmethane dyestuif containing one phenyl radicle substituted by a diethylamino radicle and two phenyl radicles, each of which carries one methyl and one amino radicle substituted by a phenyl ethylsulfonic acid radicle.

4. A triphenylmethane dyestufi containing one phenyl radicle carrying a diethylamino radicle and furthermore two phenyl radicles, each of which is substituted by an amino radicle carrying a phenyl ethylsulfonic acid radicle besides one ethyl radicle.

5. A triphenylmethane dyestuff containing one phenyl radicle substituted by a chlorine atom and two phenyl radicles, each of which carries a methyl radicle and one amino radicle substituted by a phenyl ethylsulfonic acid radicle.

HANS GROTOWSKY. 

